Great Britain's Andy Turner smiles after competing in the men's 110m during the IAAF World Athletics Championships in Daegu, South Korea. Photograph: Dave Thompson/PA

There was yet more controversy at the world championships when Cuba's Dayron Robles, the Olympic 110m hurdles champion, was disqualified after winning the final. Coming over the penultimate hurdle, Robles flung out his right arm and seemed to pull back China's Liu Xiang, who was in the lane outside him and then went on to hit the final hurdle. The disqualification, for obstruction, meant that Great Britain's Andy Turner was promoted from fourth to third, and so won the team's second medal of the championships. Jason Richardson of the US was awarded the gold, winning in a time of 13.16sec. Liu took the silver.

Turner, the European and Commonwealth champion, was already back at the athletes' village when the news broke. "Oh my God, I've got mixed emotions," he said. "I don't know what to do. I want to cry, but I don't want to cry – I didn't want to win a medal by default, but I have won a world championship bronze medal and I'm over the moon with that." But then, ever the perfectionist, he added, "But I'm still disappointed with how I ran it." His time, 13.44sec, may not have been great, but Turner still beat the Olympic bronze medallist and four-times US champion, David Oliver.

Just like Usain Bolt, Robles seemed to know exactly what he had done. When he crossed the line his first instinct was not to celebrate, but to hold his head and then hug and apologise to Liu. The Chinese team were quick to protest against the result, and the Cuban team's subsequent appeal on Robles's behalf was quickly rejected. "I'm really sorry about the situation," said Liu, "I am good friends with Robles, and I would prefer a happy competition."

Earlier, Richardson's US team-mate Carmelita Jeter won the women's 100m final in a time of 10.90sec. Jeter's strong finish saw off the two Jamaicans, Veronica Campbell-Brown, who took silver, and Olympic and former world champion Shelly-Ann Fraser-Pryce, who finished fourth behind Kelly-Ann Baptiste. There were only 0.02sec between the three, but Jeter was two metres in front of them all.

The women's 400m final was much tighter. Amantle Montsho won Botswana's first gold medal at a world championships. Montsho led coming into the home straight, but had to dig deep to hold off Allyson Felix in the final 50m. They were almost shoulder to shoulder as they finished, with Montsho just 0.03sec ahead of the American.